1. Remember hundreds, tens and units!
Today we are going to learn to add 2 and 3 digit numbers using partitioning.
Remember hundreds, tens and units!

2. What strategies would you use to add 2 two-digit numbers quickly?
This is one way to do it.
Split the tens.
Split the units.
Count on.

3. 72+15=
Split the tens. Split the units.
= 80
80+2=82
82+5= 87

4. 43+56=
Split the tens. Split the units.
= 90
90+3=93
93+6= 99

5. =
Split the hundreds. Split the tens. Split the units.
= 300
300+40=340
340+30=370
370+3=373
373+4=
377

6. Work out the answers before the questions disappear!
21+63=
45+51= 96 84 =
873
How well did you get on?